Diversidade genética entre acessos de espécies cultivadas de pimentas

Monteiro, Eduardo Raposo; Bastos, Ethyênne Moraes; Lopes, Ângela Célis de Almeida; Gomes, Regina Lúcia Ferreira; Nunes, José Airton Rodrigues

doi:10.1590/s0103-84782010005000015

Cited by 22 publications

(24 citation statements)

References 12 publications

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“…obteve valores de coeficiente de variação para comprimento do fruto (8,55%), diâmetro do fruto (6,93%) e peso de frutos por planta (41,45%), próximo aos apresentados neste trabalho. Monteiro et al (2010) constataram coeficiente de variação de 8,9% para largura de fruto. Moreira et al (2010) apresentaram o coeficiente da variação para produção de 23%; para diâmetro de fruto, o coeficiente de variação foi de 17,04%.…”

Section: Resultsunclassified

Obtenção e caracterização morfoagronômica de linhagens de pimenta do tipo Jalapeño Amarelo

et al. 2017

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RESUMO O gênero Capsicum, de grande importância mundial, ocorre tanto nos países tropicais como nos de clima temperado. De um total de 31 espécies, apenas cinco são consideradas domesticadas, as demais, semidomesticadas ou silvestres. Nos últimos anos, as pimentas passaram a ter maior demanda pelo mercado e, consequentemente, os trabalhos relacionados à caracterização, melhoramento e obtenção de novas cultivares receberam mais atenção dentro de instituições públicas de ensino e de pesquisa, assim como no setor privado. Este trabalho foi desenvolvido na Embrapa Hortaliças, com objetivo de caracterizar morfoagronomicamente linhagens de pimenta do tipo Jalapeño Amarelo, atividade essencial para o desenvolvimento de cultivares. Primeiramente foram identificadas três plantas segregantes da cultivar comercial do tipo Jalapeño Vermelho, que apresentaram frutos de coloração amarela. Com base nesse material, o trabalho foi desenvolvido em duas fases: na primeira, obtenção de linhagens homozigotas pelo método de Descendência de Uma Única Semente (do inglês Single Seed Descent); na segunda, caracterização das linhagens obtidas através de cinco descritores morfológicos de Capsicum propostos pelo IPGRI (1995) e posterior avaliação qualitativa das linhagens em campo, sendo usado o teste Scott-Knott para a análise estatística. Conclui-se que o método de melhoramento utilizado foi satisfatório, visto que, em 30 meses de trabalho, as linhagens avançaram cinco gerações (S5). A caracterização morfológica e a avaliação qualitativa permitiram identificar diferenças significativas entre as linhagens. As linhagens promissoras identificadas neste trabalho foram CNPH 25.368, CNPH 25.373, CNPH 25.374, CNPH 25.375 e CNPH 25.377.

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Section: Resultsunclassified

Obtenção e caracterização morfoagronômica de linhagens de pimenta do tipo Jalapeño Amarelo

et al. 2017

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“…The proportion of polymorphic loci and N E were highest in the C. chinense samples, and the H O and H E proportions of heterozygous plants in this sample were also higher than those estimated in the C. annuum and C. baccatum samples. The highest genetic divergence based on morphological and agronomic traits was detected in the C. chinense accessions (Monteiro et al, 2010).…”

Section: Discussionmentioning

confidence: 97%

“…A high level of genetic divergence has been reported in various accessions of Capsicum species maintained at BAGC based on morphological and agronomic markers (color, form, measures of plant parts, flowers, and fruits, number of stems) (Monteiro et al, 2010). The results of a/b-esterase polymorphism investigation using PAGE in our study indicated that the genetic diversity of the C. chinense, C. annuum, and C. baccatum accessions is also characterized by high mean values for the proportion of polymorphic loci and the observed and expected proportion of heterozygous plants.…”

Section: Discussionmentioning

confidence: 99%

“…Genetic characterization of the samples allows the introduction of the accessions into an environment and guides the development of future cultural practices. The polymorphisms for morphological and agronomic traits of plant and fruit are extraordinarily important and frequently the main aim of selection programs (Monteiro et al, 2010). Therefore, molecular polymorphism is valuable information for the genetic characterization of Capsicum pepper accessions maintained at BAGC.…”

Section: Introductionmentioning

confidence: 99%

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Genetic diversity analysis of Capsicum spp germplasm bank accessions based on α/β-esterase polymorphism

Monteiro

Bronzato²,

Orasmo³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. Genetic diversity and structure were analyzed in 10 accessions belonging to Banco Ativo de Germoplasma de Capsicum located at Federal University of Piauí in northwestern Brazil that receives pepper samples grown in community gardens in various regions and Brazilian states. Selections were made from seeds of C. chinense (4 accessions), C. annuum (5 accessions), and C. baccatum (1 accession). Samples consisting of leaves were collected from 4-10 plants of each accession (a total of 85 plants). Native polyacrylamide gel electrophoresis was used to identify α-and β-esterase polymorphisms. Polymorphism was clearly detected in 5 loci. Sixteen alleles were found at 5 α/β-esterase loci of the three Capsicum species. In the C. chinense samples, the highest H O and H E values were 0.3625 and 0.4395, respectively, whereas in C. annuum samples, H O and H E values were 0.2980 and 0.3310, respectively; the estimated H O and H E values in C. chinense samples were higher than those detected in C. annuum samples. A deficit of homozygous individuals was found in C. chinense (F IS = -0.6978) and C. annuum (F IS = 0.7750). Genetic differentiation between C. chinense and C. annuum at these loci was high (F ST = 0.1867) indicating that C. chinense and C. annuum are genetically structured species for α/β-esterase isozymes. The esterase analysis showed high genetic diversity among the C. chinense and C. annuum samples and very high genetic differentiation (F ST = 0.6321) among the C. chinense and C. annuum samples and the C. baccatum accession.

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“…Cruz et al (2012) argued that the cutoff point that delimits the number of genotypes for each group in the dendrogram should occur at a point of sudden change of level; the cutoff point is thus subjective, and each analysis can indicate a different cutoff point (Rocha et al, 2009;Campos et al, 2010;Monteiro et al, 2010).…”

Section: Cluster Analyses Based On Quantitative Morpho-agronomic Traitsmentioning

confidence: 99%

Genetic diversity of elephant grass (Cenchrus purpureus [Schumach.] Morrone) for energetic production based on quantitative and multi-category traits

Oliveira

Daher

Menezes

et al. 2017

Chilean J. Agric. Res.

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Diversidade genética entre acessos de espécies cultivadas de pimentas

Cited by 22 publications

References 12 publications

Obtenção e caracterização morfoagronômica de linhagens de pimenta do tipo Jalapeño Amarelo

Obtenção e caracterização morfoagronômica de linhagens de pimenta do tipo Jalapeño Amarelo

Genetic diversity analysis of Capsicum spp germplasm bank accessions based on α/β-esterase polymorphism

Genetic diversity of elephant grass (Cenchrus purpureus [Schumach.] Morrone) for energetic production based on quantitative and multi-category traits

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